Which delegate method I should use to respond to clicks on a text field?

问题

I want to open a panel when the user clicks on a text field. I think I should use a delegate method that responds to the click event. I found that the

- (void)textDidBeginEditing:(NSNotification *)aNotification

method does not work, and that the

- (void)controlTextDidBeginEditing:(NSNotification *)aNotification

method works, but only when I edit the text in the text field, not then I click it. If I edit the text again, this method does not work. Why?

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Sorry, I think I want to use this on mac , not on iphone,How to do with it with cocoa?

回答1:

The textFieldDidBeginEditing: delegate method only gets triggered when the user starts editing the text inside the UITextField, as the method name implies.

If you want to trigger a method when the UITextField is touched, you should try this:

[textField addTarget:self 
              action:@selector(textFieldTouched:)
    forControlEvents:UIControlEventTouchDown];

- (void) textFieldTouched:(id)sender {
    // Display the panel
}

回答2:

The correct delegate method name is

- (void)textFieldDidBeginEditing:(UITextField *)textField

From the documentation:

This method notifies the delegate that the specified text field just became the first responder.

来源：https://stackoverflow.com/questions/680863/which-delegate-method-i-should-use-to-respond-to-clicks-on-a-text-field